1 files changed, 147 insertions, 0 deletions
diff --git a/src/ui/tool/transform-handle-set.h b/src/ui/tool/transform-handle-set.h
new file mode 100644
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+++ b/src/ui/tool/transform-handle-set.h
@@ -0,0 +1,147 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * Affine transform handles component
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *   Jon A. Cruz <jon@joncruz.org>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#ifndef SEEN_UI_TOOL_TRANSFORM_HANDLE_SET_H
+#define SEEN_UI_TOOL_TRANSFORM_HANDLE_SET_H
+
+#include <memory>
+#include <gdk/gdk.h>
+#include <2geom/forward.h>
+#include "ui/tool/commit-events.h"
+#include "ui/tool/manipulator.h"
+#include "ui/tool/control-point.h"
+#include "enums.h"
+#include "snap-candidate.h"
+
+class SPDesktop;
+
+namespace Inkscape {
+
+class CanvasItemGroup;
+class CanvasItemRect;
+
+namespace UI {
+
+class RotateHandle;
+class SkewHandle;
+class ScaleCornerHandle;
+class ScaleSideHandle;
+class RotationCenter;
+
+class TransformHandleSet : public Manipulator {
+public:
+
+    enum Mode {
+        MODE_SCALE,
+        MODE_ROTATE_SKEW
+    };
+
+    TransformHandleSet(SPDesktop *d, Inkscape::CanvasItemGroup *th_group);
+    ~TransformHandleSet() override;
+    bool event(Inkscape::UI::Tools::ToolBase *, GdkEvent *) override;
+
+    bool visible() const { return _visible; }
+    Mode mode() const { return _mode; }
+    Geom::Rect bounds() const;
+    void setVisible(bool v);
+
+    /** Sets the mode of transform handles (scale or rotate). */
+    void setMode(Mode m);
+
+    void setBounds(Geom::Rect const &, bool preserve_center = false);
+
+    bool transforming() { return _in_transform; }
+
+    ControlPoint const &rotationCenter() const;
+    ControlPoint &rotationCenter();
+
+    sigc::signal<void, Geom::Affine const &> signal_transform;
+    sigc::signal<void, CommitEvent> signal_commit;
+
+private:
+
+    void _emitTransform(Geom::Affine const &);
+    void _setActiveHandle(ControlPoint *h);
+    void _clearActiveHandle();
+
+    /** Update the visibility of transformation handles according to settings and the dimensions
+     * of the bounding box. It hides the handles that would have no effect or lead to
+     * discontinuities. Additionally, side handles for which there is no space are not shown.
+     */
+    void _updateVisibility(bool v);
+
+    // TODO unions must GO AWAY:
+    union {
+        ControlPoint *_handles[17];
+        struct {
+            ScaleCornerHandle *_scale_corners[4];
+            ScaleSideHandle *_scale_sides[4];
+            RotateHandle *_rot_corners[4];
+            SkewHandle *_skew_sides[4];
+            RotationCenter *_center;
+        };
+    };
+
+    ControlPoint *_active;
+    Inkscape::CanvasItemGroup *_transform_handle_group;
+    Inkscape::CanvasItemRect *_trans_outline;
+    Mode _mode;
+    bool _in_transform;
+    bool _visible;
+    friend class TransformHandle;
+    friend class RotationCenter;
+};
+
+/** Base class for node transform handles to simplify implementation. */
+class TransformHandle : public ControlPoint
+{
+public:
+    TransformHandle(TransformHandleSet &th, SPAnchorType anchor, Inkscape::CanvasItemCtrlType type);
+    void getNextClosestPoint(bool reverse);
+
+protected:
+    virtual void startTransform() {}
+    virtual void endTransform() {}
+    virtual Geom::Affine computeTransform(Geom::Point const &pos, GdkEventMotion *event) = 0;
+    virtual CommitEvent getCommitEvent() = 0;
+
+    Geom::Affine _last_transform;
+    Geom::Point _origin;
+    TransformHandleSet &_th;
+    std::vector<Inkscape::SnapCandidatePoint> _snap_points;
+    std::vector<Inkscape::SnapCandidatePoint> _unselected_points;
+    std::vector<Inkscape::SnapCandidatePoint> _all_snap_sources_sorted;
+    std::vector<Inkscape::SnapCandidatePoint>::iterator _all_snap_sources_iter;
+
+private:
+    bool grabbed(GdkEventMotion *) override;
+    void dragged(Geom::Point &new_pos, GdkEventMotion *event) override;
+    void ungrabbed(GdkEventButton *) override;
+
+    static ColorSet thandle_cset;
+};
+
+} // namespace UI
+} // namespace Inkscape
+
+#endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :